Pi Aurigae

π Aurigae

π Aurigae
Observation data Epoch J2000      Equinox J2000
Constellation	Auriga
Right ascension	05h 59m 56.0994s
Declination	+45° 56′ 12.248″
Apparent magnitude (V)	4.348
Characteristics
Spectral type	M3II
U−B color index	1.48
B−V color index	1.83
R−I color index	1.48
Astrometry
Radial velocity (Rv)	0.8 km/s
Proper motion (μ)	RA: -2.42 mas/yr Dec.: -7.32 mas/yr
Parallax (π)	3.88 ± 0.85 mas
Distance	approx. 800 ly (approx. 260 pc)
Absolute magnitude (MV)	6.016
Details
Mass	0,4 M☉
Radius	0,5 R☉
Luminosity	0,004 L☉
Temperature	2,000–3,500 K
Other designations
35 Aurigae, HR 2091, HD 40239, BD+45°1217, HIP 28404, SAO 40756, GC 7554.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

Pi Aurigae (π Aur / π Aurigae) is a star in the constellation Auriga.

Pi Aurigae is a red M-type bright giant with a mean apparent magnitude of +4.30. It is approximately 840 light-years from Earth. It is classified as an irregular variable star and its brightness varies from magnitude +4.24 to +4.34.

References

• HR 2091
• HR 2019
• Image Pi Aurigae